Average Weather in Fresno California, United States
In Fresno, the summers are sweltering, arid, and clear and the winters are cold and partly cloudy. Over the course of the year, the temperature typically varies from 39°F to 99°F and is rarely below 31°F or above 106°F.
The hot season lasts for 3.5 months, from June 6 to September 21, with an average daily high temperature above 90°F. The hottest day of the year is July 29, with an average high of 99°F and low of 68°F.
The cool season lasts for 3.1 months, from November 20 to February 23, with an average daily high temperature below 64°F. The coldest day of the year is December 30, with an average low of 39°F and high of 55°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
In Fresno, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Fresno begins around May 9 and lasts for 5.7 months, ending around October 31. On August 8, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 92% of the time, and overcast or mostly cloudy 8% of the time.
The cloudier part of the year begins around October 31 and lasts for 6.3 months, ending around May 9. On February 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 50% of the time, and clear, mostly clear, or partly cloudy 50% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Fresno varies throughout the year.
The wetter season lasts 5.1 months, from November 5 to April 8, with a greater than 14% chance of a given day being a wet day. The chance of a wet day peaks at 27% on February 20.
The drier season lasts 6.9 months, from April 8 to November 5. The smallest chance of a wet day is 0% on August 10.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 27% on February 20.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Fresno experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 7.0 months, from October 9 to May 9, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around January 4, with an average total accumulation of 2.7 inches.
The rainless period of the year lasts for 5.0 months, from May 9 to October 9. The least rain falls around August 13, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The length of the day in Fresno varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 39 minutes of daylight; the longest day is June 21, with 14 hours, 41 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:39 AM on June 13, and the latest sunrise is 1 hour, 47 minutes later at 7:26 AM on November 4. The earliest sunset is at 4:42 PM on December 6, and the latest sunset is 3 hours, 39 minutes later at 8:22 PM on June 28.
Daylight saving time (DST) is observed in Fresno during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Fresno, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
The average hourly wind speed in Fresno experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 3.8 months, from April 4 to July 28, with average wind speeds of more than 3.0 miles per hour. The windiest day of the year is May 30, with an average hourly wind speed of 3.8 miles per hour.
The calmer time of year lasts for 8.2 months, from July 28 to April 4. The calmest day of the year is November 12, with an average hourly wind speed of 2.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Fresno varies throughout the year.
The wind is most often from the north for 1.5 months, from January 15 to February 28 and for 2.1 months, from October 25 to December 29, with a peak percentage of 37% on October 25. The wind is most often from the west for 7.9 months, from February 28 to October 25, with a peak percentage of 80% on July 14. The wind is most often from the east for 2.4 weeks, from December 29 to January 15, with a peak percentage of 29% on January 1.
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.6 months, from May 4 to August 24, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest day of the year is June 22, with an average of 8.5 kWh.
The darker period of the year lasts for 3.5 months, from November 4 to February 17, with an average daily incident shortwave energy per square meter below 3.7 kWh. The darkest day of the year is December 26, with an average of 2.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Fresno are 36.748 deg latitude, -119.772 deg longitude, and 299 ft elevation.
The topography within 2 miles of Fresno is essentially flat, with a maximum elevation change of 52 feet and an average elevation above sea level of 299 feet. Within 10 miles is essentially flat (180 feet). Within 50 miles contains only modest variations in elevation (10,449 feet).
The area within 2 miles of Fresno is covered by artificial surfaces (100%), within 10 miles by cropland (58%) and artificial surfaces (38%), and within 50 miles by cropland (53%) and grassland (24%).
This report illustrates the typical weather in Fresno, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Fresno.
For each station, the records are corrected for the elevation difference between that station and Fresno according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Fresno is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Fresno and a given station.
The stations contributing to this reconstruction are: Fresno Air Terminal Airport (87%, 6.0 kilometers, northeast); Madera Municipal Airport (5%, 40 kilometers, northwest); Lemoore Naval Air Station (Reeves Field) (3.8%, 49 kilometers, south); and Hanford Municipal Airport (3.7%, 49 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .